Sparks fly as an aurora lights up this week's sky in this gorgeous Your Shot view of nighttime Alaska.

A solar outburst glancing off the Earth's magnetic field spurs an aurora. With the sun now at the height of its solar cycle, such geomagnetic storms—and northern lights—have happened monthly (see more aurora photos).

A first-ever view of Uranus as seen from the rings of Saturn, courtesy of the Cassini spacecraft on May 1.

In orbit around the ringed planet, the spacecraft turned to view the nearby ice-blue world in April. The beauty shot of Uranus, the seventh planet from the sun, will help mission scientists calibrate the cameras aboard Cassini.

Hubble Space Telescope astronomers revealed three supernova stars with explosions